Cook N Home 2-Stage Kitchen Knife Sharpener Unique sharpening wheel design make it so easy to use, just pull back and forth; Non slip rubber bottom and ergonomically designed handle is comfortable to hold and secure; Suitable for all knife with fine edge, not suitable for serrated edge. This sharpener is not suitable for serrated edge knife; Do not push downward too hard, it may damage the edge; Do not put sharpener in dishwasher, or submerge in water, put beyond the reach of children to avoid any accident.